> >I'm just trying to understand if there is an specific
> >advantage/reason for the mention of anode vs cathode.
there's often a simple practical reason for measuring cathode current
instead of anode current. the cathode is usually at (or very close
to) ground potential, so the metering components can all have low
voltage ratings. in contrast, the anode is at high voltage, so a
series ammeter, for instance, has a high potential (pun intended) for
front-panel danger. i personally measure cathode current (0.5a or
higher), and ignore screen current (0.02a or so) and grid current
(0.00001a or less).
George T. Daughters, K6GT
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